Double-throw motor-starting switch.



s; B. GONDIT, Jn. DOUBLE THROW MGTOB. STARTING SWITCH.

nrmonlon Hmm JAN. 2, 1909.

Patented 1m29, 19,10.

2 sums-snm' 1.

HIHIIH 20 ,96 @xml/,1.400

. s. B. coNDIT, Jn. A DOUBLE THROW MOTOR STARTING SWITCH.

AgPLIoATxoN rum) JAN. 2;, 1909A anted Mar.29,191o.

2 SHEETS-SHEET 2.

I; prf

RUM/Ns v STA RTING emu D C lao `Improvement Starting Switches, of which the following i .ing Contact maker Figures 1 and@ showi'espectively in front SEARS B. CONDIT, JR., OF BROOKLINE. MASSACHUSETTS.

Specificationy of Letters Patent,

Patented illar.' 29, 191113?.

Application filed January 2.1, 1909. Serial No. 73.485

To all whom t may concern" Be itknown that finies B. GoNni'r, Jr.,

a, citizen of the United States. residing; at Brookline, in the count)v of orfolk uand State of Massachusetts. have invented an iii Double-Throw Motordesciiptioii, in connection with the accoinpanying drawings, numerals on the drawings representing like parts.

My invention is a multi-throw switch whose handle has preferably a rotaryv moveinentwhereby is produced a reciprocating movementof the contacts; my invention residing broadly in providing in connection with opposite sets of contacts, a reciprocatactuated to 'make contact successively with said opposite contacts by a handle which is compelled to move' in a predetermined manner.

Vhile this switch is piiinariliv intended as a motor-starting switch, its use is not restricted thereto as itis applicableto a wide range of uses. Preferably also'the switch handle is capable of certain reverse movements in connection with its forward rotary movement. Also when the contacts are moved to oneposition they are antoinatically locked against accidental movement away from thatposition.

Referring to niy-preierred construction in which the switch is used for starting an induction motor, its construction is such that whenrst operated only the desired set of contacts can be closed thereby, but atteisaid contacts have been caused to coperate for the starting of the motor, then the other Umtacts are closed. To this end IV preterably provide a star wheel or cani and co-.

operating pawl. which permit the handle to 'be moved backward only when in starting position. If the handle in any other position it can only be moved forward, said forward movement however producing the same starting movementl of the contact. So that, in any event, the switch contacts cannot he operated improperly.

In 'the drawings, in which I have shown a preferred embodiment ot' my invention,

elevation and top plan va switch embodying my invention; and Figs. 3, l,v 5, and 6, are

. detail viewsshowing the handle, shaft, and controlling members respectivel in front elevation. vertical section andfsi e elevation,

parts being broken away in section for cle-arness of illustration.

is herein shown, i have applied my in vention to an oil. switch, mounted in an oil receptacle 1 and containing one set of fixed yterminals 3, l, and opposite set 5, 6, T.

between which cooperate movable'terminals l y 8, 9 and 1G. mounted on a swinging cross isa speciiication, like l bar 11, herein shown as provided with roll contacts 1Q at one side to coperatie with similar roll contacts 13 separated by springs 1l from the respective terminals Zeni. and

'shaft 19 and have 'longitudinal slots 2Q formed in their upper ends. The shaft is severed adjacent its opposite ends and provided with cranks Ql. QT. 26, pinned rigidly together at ytheir outer ends at 2T and provided with rolls 28 on said pins, to travel in the slots QQ respectively of the arms 1T Aand 18.

:The crank Q3 is enlarged to constitute a star wheel oi' cani, best shown in Figs. 3 and i. where it will be seen that it is provided with notches 29. lll. 531. the former two having ovei'lianging shoulders or stops 3Q, and the latter being- .shallow for a purpose preseiitl v to be described. Cooperating with this cani a pawl or dog pivoted at 35 and normally held in engagement with the cani by a spring` 3G. end 3T of the shaft an operating handle Suitable positive locking means of an;v desired kind is also provided. -being herein shown comprising a projecting arm 3S) notched at l0. 41, l2. i?, to receive a detentJ il carried by said handle vand normally moved to engage with said notches by a spring i5 iii the handle and adapted to be released. by a thumb button 4G. The normal movement of the handle is in the direction 4of arrow i7, Fia'. 3.

Fast on 'the outer tricaliy to the shaft 18, causes the cross bar 11 and its contact to swing to the right, Fig. l, thereby engaging the contacts 12 and 13. The switch shown is used for starting an induction motor, for which purpose it is essential that the contacts 12 and 13 shall make contact before 15 and 16 make contact, and this result is secured by the engagement of the pawl 3a with the shoulder 33, which makes it impossible for the switch to be' thrown in-any other way than as just described. The particular arrangementof the notches and shoulders of the star wheel or cam depends on the service for which the switch is to be used. Having moved the handle to the right into starting position, a further movement in the same direction operates, by the engagement of the rolls 28 with the slots 22 of the uprights 17, 18, to swing the movable contacts back to the left until the contacts 15 and 16 are closed, the handle meanwhile having swung downwardly from starting position and around to the full-line or ruiming position, Fig. 8, in which position the pawl 34 engages the notch Q9 and cooperates with the shoulder in preventing a return movement of the handle. Ars herein shown, the only position in which the handle can be swung in either direction is from the starting position, at which time the pawl engages the notch 31. The handle .can then be swung, if desired, backward to oli position so as to restore the contacts to their out-of-contact position. `When the handle is in its starting and running positions the rolls 28 and their cranks stand at right angles to the slots 22 of the uprights 17, 18, and hence tend to lock or hold the switch in closing position, but prefcrably I provide a positive locking device such as the spring-actuated latch 44, shown as hand-released at 46.

It will be understood that my invention is capable of a Wide variety of constructional details and that the embodiment herein shown is merely the preferred construction, except as otherwise restricted in the claims. The rotary movement ot' the handle need not be through a complete cycle but may be an oscillating or reciprocating movement.

and in fact, while have shown one form of cam movement for moving the contact, I believe my invention is broadly new in providing a switch having opposite sets of contacts, a contactmiaker and actuating means including a handle which limits said contact maker to a predetermined order of movements, all as more definitely stated in the claims.

Having described my invention, what claim as new and desire to secure by Letters Patent is, j

1. A' multi-throw switch, comprising starting contacts, running contacts, a reciprocato'ryswinging contact-maker for making contact therewith in the order mentioned, rotary operating means, and means for preventing any different order of contact closing.

2. A multi-throw switch, comprising starting contacts, running contacts, swingstarting contacts, and means permitting the contact-making mechanism to be moved from starting position to ofi' position by a retrograde movement of said handle.

A multi-throw switch, comprising starting contacts, running contacts, a swinging contact-maker having reciprocal. movement to swing back and forth between said starting contacts .and running contacts, a rotary handle having a running position, an oil position, and a starting position, and capable of unidirectional rotation through a plurality of complete cycles of operation, and automatic controlling mechanism bevond the control of the operator for requiring said handle to move from oi2 position forwardly past starting position to get to running position, but permitting said handle to be moved backward from starting position to ott position.

5. A multi-throw switch, comprising separated contacts, a reciprocatory swinging contact-maker. and operating means therefor including a rotary handle capable of unidirectional movement to star-..-ng position, running position, and eti position successivciy, controlling cani rotating with said hand and a pawl cooperating with said cani, L restricting said handle to a predetermined order of rotary movement.

6. ln a multi-throw switch, independent separated contacts, a reciprocatory swinging contact-maker for successively contacting therewith, a rotary handle pivoted eccentrically of the pivot of said swinging contactmaker, and a slot and crank connection netween said contact maker and handle for translating the rotary movement. of the handle into reciprocating movement of the con-- tact-maker, said crank standing at right angles to the slot when the switch .is in closed position and thereby tending to hold the switch in said closed position.

7. Inv-a 1nnlti-tlirovv switch, a reciprocal latter to a predetermined direction of move- ;tory swinging contact-maker having an ott' position, a starting positionyand a ruiming position, starting contactsto. be engaged by said'Contact-maker when in its starting' posi! tion, vrnnnil'ig contacts'to beiengaged by said col'itact-maker when in its ruiming position, l a .handle for operating said swinging contact-maker, and means for controlling theV direction of movement o fsaid handle to -`compel the contacbmaker to make contact successivelywith said contacts 1n an unvary- "ing predetermined order "with relation to said oft'- position.

` A8..- I" a multi-throw sivitcln-a rotary shaft provided with swinging cranks, means' to rotatesaid shaft a'nd cranks, an eccentrically swinging contact maker lhaving slotted np- :rights engagedby said cranks for translat-A ing therotary Amovement of the shaft into vreciprocatory movement A of the Contact maker, and Aopposite contacts to be successively engaged by said Contact maker.

9. In a n'iulti-throvsT switch, a rotary shaft provided with swinging cranks, means to rotate said shaft anderanks, an eccentrically swinging. Contact makerwhaving slotted up rightsengaed-by said cranks, cam mechanism ,actuate'` vby said shaft for restricting the ment, and opposite contacts to be engaged by said contact maker.

l0. In a multi-throw switch, a rotary shaft provided with swinging cranks, means 'to rotate said shaft and cranks, an eccentrically swinging contact maker having slotted nprights engaged by said cranks, a

cam and a cooperating dog actuated by Saidshaft for restricting thc latter to a prede tei-mined direction of movement, and opposite contacts .to be engaged by saidcontact maker.

ll. In a multi-throw switch, a v rotary shaft provided With swinging cranks, means to rotate saidrshaft and cranks', an eccentric-ally swinging contact4 maker vhaving slotted nprights engaged by said cranks, and hand-released locking mechanism for antoinatically locking the switch in closed position.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing Witnesses.

'SEARS Bv. CONDI'I, JR.

IVitneSSeS:

M. J SPALDING, IVM. J. PIKE. 

